I wouldn't use one. I thought about it though. On my training hikes I found that (a) I didn't need it, and (b) it just distracted me. I just use the maps to estimate my mileage. :) -- Austin Williams www.PlanYourHike.com Info on PCT gear, resupply points, maps, movies, etc. "Courage is being scared to death - but saddling up anyway." -John Wayne